Automatic elevator-brake



(No Model.)

OLK. ROGERS.

' AUTOMATIC ELEVATOR BRAKE.

No. 313,451. Patented Mar. 3, 1885.

WITNESSES- l I I I FT 1 YQQEGAM,

N. PETERS Fhnlolfllvognphar. Washington D C,

UNirn STATES Arena tries.

COLUMBUS K. ROGERS, OF SALEM, MASSACHUSETTS.

AUTOMATIC ELEVATOR=BRAKE.

SPECIFICATION forming part of Letters Patent No.313A51, dated lVIarch 3,1885.

Application filed November 12, 1894. (No model [0 all whom, it mayconcern:

Be it known that I, COLUMBUS K. ROGERS, of Salem, in the county ofEssex, in the State of Massachusetts, a citizen of the United States,have invented a new and useful Improvement in Automatic Elevator-Brakes,of which the following is a full, clear, and exact description,reference being had to the accompanying drawings, forming a part of thisspecification, in explaining its nature.

This invention relates to means for stopping the descent of an elevatorin case the hoisting-rope should part. Its details will readily beunderstood from the following description.

In the drawings, Figure 1 is an elevation. Fig. 2 is a transversesection 011 the line Q. Fig. 3 is a transverse section on the line 1?.Fig. 4 is'an enlarged View of the braking apparatus, wedge, and shoe.Fig. 5 is a transverse section of the wedge F at line X X.

A is the floor of the elevator.

J J indicate the floors of the building which it serves.

L is the hoisting beam, which carries the hoisting pulley or drum 0.

T is a sill at the bottom of the elevatorshaft. It serves as theanchorage of brakerods D, and any proper anchorage is its equivalent.

B is the head of the elevator, which is a frame for containing theelevator part of the braking apparatus.

1 1 are the uprights of the elevator -shaft, and R R are the fixedguides on which or in which counterpart guides in the elevator-car fit.

Care the uprights of the elevator-car,which connect the head B andbottom A of the car. Just inside these uprights, from top to bottom ofthe elevatorshaft, are stretched the brakerods D, represented in thedrawings as wire ropes. They are represented as passing through beam Land through cup -washers above it, and as spread and wedged in thesewashers; but any other suitable way of making the upper ends of theserods fast to the beam L may be adopted. These rods D are anchored at Mat the bottom of the elevatorshaft. A box, IE, is formed at each end ofthe headbeam B, the outer end of which is just clear of brake-rod D. Thehoisting-rope N passes through an eyebolt, which lays hold of head-beamB through the spring H.

In the headbeam B are a pair of levers, G, hitched to the eyebolt, theouter ends of which engage with wedges F. It will be seen that by thisarrangement the weight of the car will compress the spring H, lift theinner ends of levers G, and lower the outer ends so longas hoisting-ropeN sustains the car, While if the rope N be parted the extension ofspring H will lift the outer ends of lovers G and raise the wedges F.These wedges F have a tongue, F, formed on them, which tongue F bearsagainst the brake -rod D in a recess of. the box IE. (Shown particularlyin Fig. 3.) Each Wedge F has on its inner side two inclined planesterminated by hooks at their upper ends, and the thin ends of the wedgesare up. Two transverse bolts, S, are under the hooks of the wedges, andthe wedges normally rest on these bolts. Bolts S extend across box E inthe end of head-beam B. \Vhen the levers G are moved by the spring H, toraise the wedges F, the inclined planes on the back of the wedges run upagainst the bolts S, and the tongue F nips the brake rod D between itand the end of box E, and the .descent of the car is checked.

In former use of wedges to check the descent ofan elevator-car when therope breaks, the wedges have been made to bite on the cheeks of thevertical guides in the elevatorshaft. In this, special suspension-rods(called above "brake-rods) are provided, and no re liance is placed onthe guides or ways. It is comparatively easy to make the box E in thehead-beamBstrong enough not to be sprung by the wedges; but when thebraking-wedges are brought to bear against the ways they must be bracedfrom outside not to spring.

It is obvious that the brake-rods might be made stout enough to act asvertical ways; but in this case they would be brake-rods as well asways.

Having thus fully described my invention, I claim and desire to secureby Letters Patent of the United States 1. The combination, with the carof an elevator and its hoisting-ro pe, of the spring H, adapted to becompressed by the weight of the car when suspended by the hoistingropeand IOO to extend when the hoisting-rope gives way, 2. In combinationwith the box E at the :0 in combination with levers G, Wedges F, and endof the head-beam of an elevatorcar, the pins S, arranged in the box E ateither end of transverse pins S and wedge F, adapted in its the head-bearn, and in further combination Vertical motion to be driven towardthe end 5 with brake-rods D, extended from one end to of the boX E,substantially as described.

the other of theelevator-shaft, whereby on COLUMBUS K. ROGERS. theparting of the hoistin g-rope the brake-rods Witnesses: D are seized bythe brake F and box E, sub- E. A. PEALEN, stantially as described. THos.WM. CLARKE.

